import numpy as np
import time

a = np.array([1, 2, 3, 4])
print(a)
print(a.dtype)
b = np.arange(0, 10, 3)
print(b)
c = np.random.random((2, 2))
print(c)
d = np.random.randint(0, 10, size=(4, 4))
print(d)
array_zero = np.zeros((3, 3))
print(array_zero)
array_ones = np.ones((4, 4))
print(array_ones)
array_full = np.full((2, 2), 9)
print(array_full)
array_eye = np.eye(3)
print(array_eye)